Chain wrench



C. S. WRIGHT.

CHMN WRENCH. APPLICATION FILED FEB. 19.1921.

1,400,39 Patented M13, 1921.

Iuvswrorz WITNESS I Q I 7W W wires stares cLYn -slj WRIGHT, on TOLEDO, OHIO, Assrenonro" THE narrower, SUPPLY or 'ronnno, orrro, A oonrfonarroiv or onro.-

arr creme.

COMPANY,

01mm wnrnvorr.

Specification of Letters ?atent. Patented Dec, 13, 1921,

Application filedFebruary 19, 1921. Serial No. 446,427.

To all whom it may concern:

Be it known that I, CLYDE S. WRIGHT, citizen of the United States, residing at Toledo, in the county of Lucas and State of Ohio, have invented new and useful Improvements in Chain Wrenches, of which the following is a specification.

My invention relates to chainwrenches, and the obj ect thereof is to provide a Chain or similar type of wrench which grips an object and rotates it in either direction without the necessity of changing the position of the wrench on the said object or making any adjustments. vide a wrench of the chain-type with a jaw which may be replaced by other jaws suitable for seizing different sizes of objects. Another object is to provide means whereby increased leverage may be had over wrenchesof the said type and whereby all the gripping teeth on the handle jaw may beemployed on the object to be turned. Other obj ects appear hereinafter.

Referring to the accompanying drawing, Figure 1 is a side elevation of one form of my wrench applied to a tubular object; Fig. 2, a top plan view of Fig. 1; Fig. 3, aside elevation of the handle-jaw, with a portion broken away; and Fig. 4, atop plan view of Fig. 8. i V On the drawing, 1 designates the central or body portion of my wrench. It comprises a block of metal, as steel, with approximately a rectangular cross-section. Its lateral faces 2 are parallel and smooth and constitute bearing surfaces for the parallel lateral or wing members 3 of the handlejaw member 4. The member l has its outer face 5 preferably curved and provided at each side of its transverse center line with one or more gripping teeth'6. I have shown only one tooth at each side of said center line. The outerface of the jawispreferably recessed or spaced backof the biting edges of the teeth so that this face will not contact with the surface of any pipe or round objecthavinga radius within certain limits. For objects having sizes outside these limits, jaws with teeth differently spaced, and with the outer faces of the jaws differently shaped may be provided. For gripping small objects the jaw l should have the teeth 6 nearer together than for gripping larger objects.

The face of the jaw 4 opposite the face 5 Another object is to prov and between the wings 3 has a transverse groove or recess '1 into which the transverse rib or lug 8 on the body 1 projects, but the of the recess and is not so wide as the recess; that is, the lug is spaced at all points from the wall of therecess so as to give the body free limited movement with respect to the jaw 4. At each sideof the recess 7 there is a transverse roundededged fulcrum 9 with which the adjacent points 10 on the inner face of the body 1 may coiiperate. Each fulcrum 9 is preferably on a radial line drawnbetween the groove 7 and a tooth 6 and from the center of a pipe, such as 24, engaged by the teeth 6. a I

The wings 3' have opposite openings 11 therein to receive the ends of the removable cross-pin 12 extended transversely through the body 1. Tliepin is spaced, somewhat from the bottoms of the openings 11 and the latter are somewhat enlarged at the sides so that the body may have a limited longitudinal and transverse movement with respect to the jaw. The pin prevents the accidental separation of the jawfrom the body 1 and holds it in operative position. i j

At each end of the body, I provide the handle sockets 18 and 13 for the removable handlesor levers let and 14:" by means of which the wrench may be operated in one direction or the other. The sockets are arranged in the same line.

Between the socket, 13 and the body 1 is a transverse opening 15 for one end of the gripping chain 16. This'end of the chain has the threaded terminal 17 with which the nut 18 having the handle 18"works. Between the socket 13 and the'body 1 is the transversezppening 20 from the outer end of which a pair of parallel wings or flanges 21 extend outwardly on the socket 13 to form a channel for the free end of the chain 16. The wings have teeth 22 on their edges to interlock with the pins 23 extending beyond the sides of the chain.

To apply the wrench to thetubular object 24:, it is placed transversely across the object with the teeth 6 against it as shown. The free end of the chain is passed around the object and through the opening 20 and drawn out through the channel between the wines 21 as tightly as possible and the pins 23 are dropped in front of the nearest teeth 22. This provides the coarse adjustlugpreferably does not reach the bottom} ment of the chain. The nut 18 may "thenbe turned ifnecessary to provide a finer or closer adjustment of the chain to the object 24. If the object is to be rotated clockwise, the handles 14 and 14 are operated clockwise. The'leftf point on, the

lever presses the left fulcrum 9 toward the object 2%. As the fulcrum 9 is between the teeth 6, both teeth, or the teeth at eachside of the center of the jaw, will be forced against the object,'which would not be the case if the jaw 4 were rigid with the body 1, because the left tooth would then become the fulcrum and the right tooth would be lifted outwardly more or less according to the degree of slackness of the chain. There will be-more or less slackness due to the loose setting of the nut 18, or to the stretch me" V 10 cooperate in a manner readily undercenter, and also having between the toothed portions afulcrum on which the said body stood from the preceding description.i'

While I have shown the jaw movable on I the body I do not restrict all of my claims to this feature.

Iclaim: V 1. In a wrench, a body, an operating handle therefor, a flexible gripping member having its ends connected to opposite; ends of the body and adapted to be placed around an object to be turned, and a inov-r able jaw adapted to be placed between the said body and object, and having'a toothed portion at opposite sides of its transverse may rock. r

2. In a wrench, a body, an operating handle therefor, a flexible gripping 'memher having its ends connectedto opposite ends of the body and adapted to be placed around an object to be turned, and a movable jaw adapted to be placed between the said body and object, and having a toothed portion atopposite sides of its transverse center, and alsofhaving between each toothed portion and the said transverse center a; 1 fulcrum on which the, said body may rock. I

3. In a wrench, a body, an operating handle therefor, a flexible gripping member having its ends connected to opposite ends of the body and adapted to be placed around an object to be turned, a movable jaw adapted to be placed between the said bodyand object, and havinga toothed porof the chain, or to the embedding of;

k the chain in the object 24. 1 e

,7 If the object 24lis to be turned anticlock-.. wise, the right hand fulcrum 9 and the point tion at opposite sides of its transverse center, and also having between the toothed portions a fulcrum on which the said body may rock, and means for loosely retaining the jaw onthe body.

j 4:. In a wrench, a jaw having its grip ping face provided with a toothed portion at one side of its transverse center, an operating Inemberloosely seated on the face 'of the jaw opposite the, toothed face,'andhav ing a fulcrum on the first face, and a flexible gripping member adapted to have its 7 ends attached to the operating member and to grip an object in contact ping face of the'jaw. j I

5. In a wrench, a jaw having its gripping face provided with a toothed portion at both sides of its "transverse center, an

with the gripoperating member loosely seated on the 7 face of the jaw opposite the'toothed face,

and having a fulcrum on the first face he f tweeneach toothed; face and the'said transverse "center, and a fiex ible gripping me1nber adapted to have its endsattached to the operating member and to grip-an object in contact with the grippin-g face of the aw.

.6. In a wrench, a jaw having a gripping face on one side and a pair of parallel wings on the opposite side thereof, an operating member seated on the, oppositeface between the wings, means for loosely con-.

necting the'j aw and the operating member together, and a flexible vgripping member having both of its ends attached to the opcrating member.

In a wrench, a jaw having an object gripping face, an operating member loosely fulcrumed on the opposite face thereof so as to rock transversely of an obj ectto which the gripping face is applied, and a flexible member havingboth of its ends attached to the operating member and adapted to hold said gripping face in contact with the said object. 7

8. Ina wrench, a jaw having an object gripping face, an operating member loosely connected to the jaw so as to rock trans CLYDE s. WRIGHT. 

